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Heat treatment technique of 4Cr5MoVSi die steel by utilizing forging waste heat

A technology of forging waste heat and die steel, which is applied in the field of 4Cr5MoVSi die steel using forging waste heat heat treatment process, which can solve the problems of affecting strength and impact performance, high cost pressure of the production plant, and increasing efficiency, so as to maintain high hardness and high wear resistance High performance, good surface quality, and energy-saving effect

Active Publication Date: 2014-11-19
ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Now the raw material price of steel is rising rapidly, the price of steel is falling, and the cost pressure of the production plant is very high. Many forging enterprises are adopting the feasibility of forging waste heat heat treatment, but this method has advantages and disadvantages: the advantage is that it can save energy, reduce pollution, and increase efficiency; the downside is that there is coarse martensite in the coarse structure produced by forging after quenching, which directly affects the strength and impact performance of the product. Direct quenching will cause cracks, resulting in increased scrap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The 4Cr5MoVSi die steel with a size of 2000X600X500mm is heat treated with forging waste heat, including the following steps:

[0017] (1) Send the forged raw material into the controlled cooling room, quickly cool it to 640°C within 20s, then enter the isothermal furnace, keep it at 690°C for 14 hours, and then leave the furnace to air cool;

[0018] (2) Heat up to 850°C at a rate of 60°C / hour, keep it warm for 1 hour, take it out and quench it with 8% salt water and quench 20# mechanical oil to cool, and the oil temperature is at 80°C;

[0019] (3) Heating to 170°C at a rate of 70°C / hour, keeping it warm for 5 hours, and then cooling it out of the oven;

[0020] (4) Heat up to 640°C at a rate of 90°C / hour, keep it warm for 8 hours, and take it out of the furnace to air cool.

Embodiment 2

[0022] 4Cr5MoVSi die steel utilizes forging waste heat heat treatment process, the forging size is 3000X500X500mm, including the following steps:

[0023] (1) Send the forged raw material into the controlled cooling room, and quickly cool it to 650°C within 30s, then enter the isothermal furnace, keep it at 680°C for 12 hours, and then leave the furnace for air cooling;

[0024] (2) Heat to 860°C at a rate of 70°C / hour, hold for 0.5 hours, take out and quench 20# mechanical oil with 6% salt water to cool, and the oil temperature is 90°C;

[0025] (3) Heat up to 180°C at a rate of 80°C / hour, keep it warm for 6 hours, and cool it out of the oven;

[0026] (4) Heat up to 630°C at a rate of 100°C / hour, keep it warm for 7 hours, and then take it out of the oven and air cool.

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PUM

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Abstract

The invention discloses a heat treatment technique of 4Cr5MoVSi die steel by utilizing forging waste heat, which comprises the following steps: (1) sending a forged raw material into a controlled cooling chamber, quickly cooling to 640+ / -10 DEG C within 15-30 seconds, sending into an isothermal furnace, keeping the temperature of 680-700 DEG C for 8-16 hours, discharging, and cooling with air; (2) heating to 840-860 DEG C at the rate of 60-80 DEG C / hour, keeping the temperature for 0.5-1 hour, taking out, quenching with brine, and cooling with oil; (3) heating to 160-180 DEG C at the rate of 60-80 DEG C / hour, keeping the temperature for 3-6 hours, discharging, and cooling with air; and (4) heating to 620-650 DEG C at the rate of 80-100 DEG C / hour, keeping the temperature for 5-10 hours, discharging, and cooling with air. The technique performs heat treatment by utilizing the waste heat after forging, thereby saving the energy. On the premise of keeping high hardness and high wear resistance, the 4Cr5MoVSi die steel has fine crystal grain and good surface quality, and satisfies the quality requirements.

Description

technical field [0001] The invention belongs to a heat treatment method for forgings, in particular to a heat treatment process for 4Cr5MoVSi die steel using forging waste heat. Background technique [0002] Now the raw material price of steel is rising rapidly, the price of steel is falling, and the cost pressure of the production plant is very high. Many forging enterprises are adopting the feasibility of forging waste heat heat treatment, but this method has advantages and disadvantages: the advantage is that it can save energy, reduce pollution, and increase efficiency; the downside is that there is coarse martensite in the coarse structure produced by forging after quenching, which directly affects the strength and impact performance of the product. Direct quenching will cause cracks, resulting in increased scrap. Contents of the invention [0003] In order to solve the above problems, the present invention discloses a 4Cr5MoVSi die steel using forging waste heat...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D8/00
Inventor 罗晓芳
Owner ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING